- 1066 – William the Conqueror and his army set sail from the mouth of the Somme river, beginning the Norman conquest of England.
- 1777 – Lancaster, Pennsylvania becomes the capital of the United States for one day after Congress evacuates Philadelphia.
- 1908 – Production of the Model T begins at the Ford plant in Detroit.
- 1935 – 13-year-old Judy Garland signed her first contract with MGM.
- 1962 – Rachel Carson’s book Silent Spring is published, inspiring an environmental movement and the creation of the Environmental Protection Agency.
- 1964 – The Warren Commission report on the assassination of President John F. Kennedy was released after a 10-month investigation, concluding that there was no conspiracy and that Lee Harvey Oswald, the accused assassin, acted alone.
